Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cay phoi » cap phoi, tay hoi, cay cho
tinh ve » trinh ve, tinh ven, dinh ve
va tinh » may tinh
sach ky » sac ky, sach y, sach ty
te sach » toc sach
xay hoi » xa hoi, tay hoi, gay thoi
ky dang » ky nang, ky danh
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cao
ve cua » le cua, de cua, te cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky dang ((xay hoi) or (cay phoi)). hieu ((ve cam) OR (va cam)) duc va tinh ve cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang ((xay hoi) OR (cay phoi)). hieu ((ve cam) OR (va cam)) duc va tinh ve cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang ((xay hoi) or (cay phoi)). hieu ((ve cam) OR (va cam)) duc va tinh ve cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach ky dang ((xay hoi) or (cay phoi)). hieu ((ve cam) OR (va cam)) duc va tinh ve cua triet*.